Stock-Based Compensation (Summary of Stock Option Activity) (Details)	6 Months Ended
	Jan. 31, 2020 $ / shares shares
Options Outstanding
Beginning balance (in shares) | shares	6,531,250
Options granted (in shares) | shares	929,941
Options exercised (in shares) | shares	(610,997)
Options canceled (in shares) | shares	(45,894)
Ending balance (in shares) | shares	6,804,300
Weighted Average Exercise Price
Beginning balance (in usd per share) | $ / shares	$ 39.66
Granted (in usd per share) | $ / shares	51.96
Exercised (in usd per share) | $ / shares	29.06
Canceled (in usd per share) | $ / shares	53.27
Ending balance (in usd per share) | $ / shares	$ 42.20